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Electron Probes of Molecular Structure and Ultrafast Molecular Dynamics.

Electron Probes of Molecular Structure and Ultrafast Molecular Dynamics.


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About the Book

The focus of our research is on developing an applying new techniques for probing the structures of molecules as they undergo ultrafast chemical reactions. Two techniques were developed in our laboratory. The first one is the ultrafast megavolt electron diffraction. We demonstrated that using highly relativistic (5 MeV) electrons an ultrashort electron bunches containing tens of millions electrons can be created and sustained. That allows not only to improve the time resolution but also to get a complete diffraction pattern with a single electron bunch. We tested the technique on aluminum foil with 160 nm thickness at the Stanford Linear Accelerator. The second technique involves photoionization from molecular Rydberg states, which were found extremely sensitive to molecular structure, yet remarkably insensitive to vibrational motion. While most spectroscopic and diffraction techniques work well when the molecules are cold and thus vibrational motion is minimized studying ultrafast chemical reactions runs counter to freezing the motion since the very ability of the molecule to undergo the ultrafast chemical reaction implies that its energy is very large. The combination of unique properties of Rydberg states allows us to use them for fingerprinting molecular structure dynamics. We implemented the method to study the ultrafast curve crossing dynamics of the conjugated 1,3-cyclohexadiene, 1,2,3,4-tetramethyl-cyclopentadiene, 1,2,3,4,5-pentamethyl-cyclopentadiene. We followed the relaxation from the initially excited 1B2 state through the previously elusive 2A 1 state, from where the molecules relax through a conical intersection to the ground state. Since the spectroscopy applies to molecules on the ground state, we can identify the molecular geometry immediately after the curve crossing. We observed that cyclopentadiene derivatives revert back to the original cyclic structure, cyclohexadiene opens its ring to form hexatriene.


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Product Details
  • ISBN-13: 9781244059023
  • Publisher: Proquest, Umi Dissertation Publishing
  • Publisher Imprint: Proquest, Umi Dissertation Publishing
  • Height: 246 mm
  • Weight: 195 gr
  • ISBN-10: 1244059021
  • Publisher Date: 01 Sep 2011
  • Binding: Paperback
  • Spine Width: 5 mm
  • Width: 189 mm


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